BACKGROUND AND SUMMARY OF THE INVENTION

The present invention relates generally to a system for use in filtering a variety of

environmental substances, and more particularly to a method and apparatus for filtering such

substances as soil, sediment, and debris from such things as water runoff that may be entering

storm drains or catch basins for example.

In recent years, State and Federal governments have placed controls on sources of pollution and on circumstances that may lead to erosion of an environmentally protected

substance.. One source of water pollution is called runoff. Runoff can include dust and other particulates from roads, leaves from trees, top soil, grass cuttings from lawns and parks and fallout from air pollution. Runoff can be particularly problematic when the source of water is

from an area of ground which has been disturbed or broken up, such as may be found at construction sites. Runoff from these areas may contain a high amount of soil and debris. Additionally, runoff caused by a storm may be particularly heavy and dynamic and therefore may carry a great deal of particulates in a short period of time. During a storm the rate of storm water runoff can be several times the normal flow. Various methods have been

developed in an attempt to minimize the adverse effects of runoff.

The present invention is designed to provide an easy to install and maintain environmental filter system. The present invention includes an envelope of filter material

which is proportioned to receive an inlet device such as a storm sewer grate. The envelope may be of various sizes to accept inlet devices of varying size. The present invention may

comprise porous fabric that may be stitched, glued, welded, riveted, or otherwise formed into

an enclosure or envelope to house an inlet device. In a separate embodiment the present

invention also may inlcude a roll of erosion matting. The roll may be utilized alone or along with the envelope of filter material to prevent silt, rocks, debris, etc. from entering curb inlets. For example, a storm sewer grate may be placed within the filter envelope of the present invention and then positioned on the catch basin in its customary location. The

present invention may prohibit soil, rubble, stones, or debris from entering the sewer. The

present invention avoids the necessity of removing soil, silt, stones and other p articulate matter

from within the sewer and thus avoids the expense and cost associated with such filters.

Additionally, the present invention may act as a double filter for the runoff. The present invention surrounds the inlet device and therefore is located both above and below the inlet device. For example, water entering a sewer grate will be filtered both by the layer of fabric located above the grate and by the layer of fabric located below the grate since the grate

will reside inside the envelope formed by the fabric.

Maintenance and cleaning of the present invention and may only involve periodic removal of p articulate matter that may build up on the inlet device. Removal of the present

invention may involve merely lifting the inlet device and removing the device from the filter envelope. Alternatively, the filter of the present invention may be cleaned or another filter may be used to again receive the inlet device, such as a sewer grate, and be installed onto the inlet, such as a catch basin.

The roll filter of the present invention provides additional drainage area to the filter envelope. Additionally, use of the roll filter may provide rigidity to the filter envelope to prevent the water pressure from forcing the filter into the inlet.

These and other advantages will be apparent from the following detailed description of

the invention, drawings, and claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The various features and advantages of the present invention may be more readily

understood with reference to the following detailed description taken in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and in

which:

Figure 1 is a side view of a preferred embodiment of the present invention;

Figure 2 is a plan view of the embodiment of Figure 1 with a storm sewer grate inserted

halfway into the sack of the present invention;

Figure 3 is a prospective view of one embodiment of the present invention installed on a

storm drain;

Figure 4 is a section view taken along line 4-4 of Figure 3;

Figure 5 is a perspective view of one embodiment of the roll filter of the present invention;

Figure 6 is a perspective view of the roll filter combined with the filter envelope; and Figure 7 is a perspective view of the roll filter and the filter envelope installed on a curb

drain.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT.S Referring to Figure 1, a filter envelope 10 of the present invention may be seen. The filter

may comprise a water permeable fabric or composition of fabrics or other suitable material

conducive to filtering out debris, soil, and sediments, while allowing water to pass through the filter. The filter may be constructed from a single portion of fabric which has been folded back on

itself and stitched or otherwise secured along its edges. Preferably, the filter has an opening 12

configured to receive an inlet device, such as a sewer grate. Additionally, the envelope may have a

flap 14 to enclose the inlet device within the filter. Figure 2 shows the filter envelope 10 of Figure

1 with the inlet device 16 partially inserted inside the filter 10. The inlet device 16 may be inserted

completely within the filter envelope 10 and the flap 14 may be inserted within the opening 12 to enclose the inlet device 16 within the filter envelope 10.

Referring to Figures 3 and 4. an example of the operation and installation of the filter

envelope 10 of the present invention may be seen. After a sewer grate 16 has been enclosed within

the filter envelope 10, the sewer grate may be placed within a catch basin 18 in its customary

position as shown. The filter envelope 10 encloses the sewer grate on both an upper surface 20 and

a lower surface 22. As runoff 24 flows into the catch basin 18, it may be filtered by both the upper and lower surfaces of the filter envelope 10 at 20 and 22 respectively. This may effect a double filtering of the runoff 24 that enters the catch basin 18.

Referring to Figure 5, a roll filter 30 of the present invention is shown. The main body of the roll filter may comprise turf reinforcement matting or other porous material The matting material may comprise 1/2 inch of coconut fibre stitched between ultraviolet stabilized

polypropylene mesh. This material may be cut into rectangular pieces and rolled to approximate a cylinder and may be inserted into a tube of geotextile material. Preferrably, matting is cut into 48" x 42" pieces and rolled to form a cylinder of 8" or 12" diameter. Additionally, matting may be sewn, glued, welded, or secured in other commonly known ways onto the ends of the roll Steel

straps 32 may also be embedded into the roll It is recognized that several means of securing the roll to the inlet are readily available and would be apparent to those of ordinary skill in the art. The straps 32 may be replaced with weights, pins, hooks, anchors, and other well known means for

preventing movement of any device exposed to nature's elements. Figure 6 shows another embodiment of the present invention where the roll filter 30 is sewn at 34 to a filter envelope 10.

Figure 7 shows how the roll filter 30 and the filter envelope 10 may be combined to filter

runoff that is entering a curb drain 36 on a street 38.. The roll filter 30 may have straps 32 that may hook over the curb drain 36 or structure hood 37 to provide additional structural support. The roll

filter 30 may be sewn or otherwise secured to the filter envelope 10 or may just be positioned upon the filter envelope 10.

The present invention has been described in the form of preferred embodiments, but it is to be recognized that several modifications and variations to the invention could be made and fall

within the scope of the subjoined claims.